Which of the following is not characteristic of a thunderstorm?
a. strong updrafts
b. strong winds
c. rain and snow at intermediate altitudes of the cloud
d. small raindrops
e. potentially large hailstones

option is option d)

Explanation:

the correct option is option d)

the characteristic of thunderstorm  can be seen by the following scenario

in thunderstorm there is lot of movement of air the lighter i.e.warmer air moves up and the colder air moves down creating the condition of thunderstorm.

heavy rain , strong wind , potentially large hail stones is the situation of the thunderstorm.

during thunderstorm there is rain and snow at intermediate.

hence only option left is option d.